C-215: Freeze protection

Q: How do I check a C-215 fault?

1. Stop and do not bypass protection 2. Check setpoint and flow 3. Verify sensor calibration Safety: Refrigerant work requires certified technicians; isolate power before panel access.

Probable causes

Leaving chilled water setpoint too low
Low flow
Sensor drift

Step-by-step checks

Stop and do not bypass protection
Check setpoint and flow
Verify sensor calibration

Safety: Refrigerant work requires certified technicians; isolate power before panel access.

Sample code — verify with the OEM manual for your exact model.

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Frequently asked questions

What does C-215 mean on a Chiller?

C-215 usually indicates: Freeze protection. Confirm the meaning in the manufacturer's manual for your model.

What causes C-215?

Leaving chilled water setpoint too low; Low flow; Sensor drift.

How do I check a C-215 fault?

Work through the numbered checks above in order, recording readings as you go. Refrigerant work requires certified technicians; isolate power before panel access.

Other Chiller codes

Disclaimer: Fault code information is guidance only. Codes and meanings vary between manufacturers and models — always follow the manufacturer's manual and your site's safety procedures, and use qualified personnel for electrical, pressure, refrigerant and combustion work.